High-efficiency preparation of visible light induced nano-TiO2 crystallization liquid

Abstract

The invention relates to a method for manufacturing a visible light inductive TiO2 nanometer crystal sol liquid. The method comprises the following steps: mixing titanium salt as a raw material with a basic solution to generate a titanium dioxide hydrate; dispersing the hydrate with proper water after the hydrate is subjected to washing and impurity removal for several times so as to form a suspension system of the titanium dioxide hydrate with certain concentration; adding a composite complexing agent into the system to form a TiO2 sol liquid; after the sol is statically aged, forming a gel system with good suspension property; and forming a crystal liquid with better stability after the gel system is subjected to boiling refluence. The formed crystal liquid has visible light photocatalyst property; and a product can be applied to the surface of an object through spraying, and is dried in the shade to form a film or a coating with excellent adhesive force with the action of photocatalyst or self-cleaning in irradiation of the visible light. The crystal sol has the advantages of non toxicity, non secondary pollution, high visible light activity, non requirement of ultraviolet source, simple preparation process and strong operability, and can be used on the surface of an organic or inorganic substance in large scale.

Description

technical field [0001] The invention belongs to the field of preparation of photocatalyst materials, in particular to a nano-TiO 2 The soft chemical preparation method of the crystallization liquid can be used to prepare a large amount of liquid-phase photocatalyst materials with high photocatalytic activity, and the method is simple and highly controllable. Background technique [0002] Photocatalyst (Photocatalyst) is a high-efficiency, green and environment-friendly material that can effectively convert solar energy into chemical energy, so it is widely used in the field of environmental purification, such as sterilization and antibacterial, air and water purification, dust and fog prevention, etc. [0003] Traditional photocatalysts are mostly anatase TiO 2 , this kind of photocatalyst has the characteristics of high chemical stability, light corrosion resistance, harmless to human body, cheap, and has a deep valence band energy level, so it has become one of the most p...

AI Technical Summary

Problems solved by technology

Due to the high surface energy of nanoparticles, it is easy to reduce the surface energy through agglomeration, so it is difficult to maintain good uniformity during use, resulting in a decrease in photocatalytic activity; the other is through the sol-gel method, which uses organic matter complexation agent, forming TiO 2 sol, due to the TiO prepared by this method 2 The particles have an amorphous structure, so they do not have photocatalytic activity, and must be crystallized by appropriate heat treatment to make TiO 2 Only when the particles undergo crystal transformation and form an anatase structure can they have the ability to photocatalytically degrade organic pollutants. Therefore, the coating body must be a high-temperature-resistant inorganic material, and this method is not suitable for making large-scale coatings.